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以1 W功率的Ar等离子体对聚丙烯(PP)多孔膜作了表面处理,通过失量法和扫描电镜(SEM)法研究了等离子体的气氛压力和处理时间的表面刻蚀作用,并以水通量法评价了PP膜多孔隙内部的改性状况。结果表明,表面刻蚀作用随着等离子体气氛压力的降低及处理时间的延长而增强。中等气氛压力(18 Pa或30 Pa)的等离子体处理可使PP膜均匀通水,表明具有适中能量水平以及活性粒子密度的等离子体气氛是实现多孔膜多孔隙内部均匀改性的重要因素。为实现PP膜多孔隙内部的均匀处理同时降低表面刻蚀作用,10min、18Pa的等离子体处理条件较为合适。处理表面产生的羧基改善了表面亲水性,但表面接触角在5 d内由44.2°急剧上升到了66.0°,之后1 a内变化平稳。
Polypropylene (PP) porous films were surface-treated with Ar plasma at 1 W, and plasma pressure and surface etching were investigated by loss method and scanning electron microscopy (SEM) The water flux method was used to evaluate the internal modification of porous PP membrane. The results show that the surface etching enhances with the decrease of plasma pressure and the extension of the treatment time. Plasma treatment at medium pressure (18 Pa or 30 Pa) allows uniform flow through of the PP film, indicating that a plasma atmosphere with moderate energy levels and active particle density is an important factor in achieving uniform modification of the porous interior of the porous membrane. In order to achieve the uniform treatment of the PP porous membrane while reducing the surface etching, the plasma treatment conditions of 10 min and 18 Pa are more suitable. The carboxyl groups generated on the treated surface improved the surface hydrophilicity, but the surface contact angle rose sharply from 44.2 ° to 66.0 ° in 5 days, after which the change was stable within 1 year.